The International Code of Signals is a system used by ships to communicate important messages at sea. It consists of flags, lights, and sound signals that convey specific meanings, helping vessels to share information about navigation, safety, and emergencies. This code is essential for ensuring clear communication between ships, especially when language barriers exist. Developed by the International Maritime Organization, the code includes a set of standardized flags, each representing a letter or a specific message. For example, the flag for the letter "A" indicates "I have a diver down; keep well clear." This system enhances maritime safety and coordination among vessels worldwide.